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    USE OF A SWELLING AGENT IN MULTI-STAGE POLYOLEFIN PRODUCTION
    8.
    发明公开
    USE OF A SWELLING AGENT IN MULTI-STAGE POLYOLEFIN PRODUCTION 审中-公开

    公开(公告)号：US20240301104A1

    公开(公告)日：2024-09-12

    申请号：US18572402

    申请日：2022-06-23

    申请人： BOREALIS AG

    发明人： Matthias HOFF ,  Joana Elvira KETTNER ,  Vasileios KANELLOPOULOS ,  Victor SUMERIN ,  Jani AHO ,  Apostolos KRALLIS ,  Kalle KALLIO ,  Irfan SAEED ,  Erno ELOVAINIO

    IPC分类号： C08F210/16 ,  C08L23/08

    CPC分类号： C08F210/16 ,  C08L23/0815 ,  C08L2205/025 ,  C08L2308/00

    摘要： The disclosure relates to a process for polymerising olefins in multi stage polymerisation process configuration, comprising a) polymerising in a first polymerisation step first olefin monomer, optionally in the presence of at least one other alpha olefin monomer, in the presence of a polymerisation catalyst so as to form a first polymer component (A), and b) polymerising in a second polymerisation step in gas phase second olefin monomer, optionally in the presence of at least one other alpha olefin comonomer, in the presence of the first polymer component (A) of step a) and an induced swelling agent, so as to for a second polymer component (B), wherein the first polymer component (A) and the second polymer component (B) are produced at production rates meeting a predetermined target weight ratio of the second polymer component (B) to the first polymer component (A), the process comprising the steps of: i) determining a first weight ratio of the second polymer component (B) to the first polymer component (A) in the second polymerisation step, and ii) increasing the concentration of the induced swelling agent in the second polymerisation step if the determined first weight ratio is less than the predetermined target weight ratio, or iii) decreasing the concentration of the induced swelling agent in the second polymerisation step if the determined first weight ratio is greater than the predetermined target weight ratio, or iv) maintaining the concentration of the induced swelling agent in the second polymerisation step if the determined first weight ratio equals the predetermined target weight ratio. The disclosure further relates to use of an induced swelling agent in a gas phase polymerisation step for improving gas phase production split in a multi-stage olefin polymerisation process.

    A PROCESS FOR PRODUCING A MULTIMODAL ETHYLENE POLYMER AND FILMS PREPARED THEREFROM
    9.
    发明公开
    A PROCESS FOR PRODUCING A MULTIMODAL ETHYLENE POLYMER AND FILMS PREPARED THEREFROM 审中-公开

    公开(公告)号：US20240279368A1

    公开(公告)日：2024-08-22

    申请号：US18569034

    申请日：2022-06-10

    申请人： BOREALIS AG

    发明人： Felice DE SANTIS ,  Tuan Anh TRAN ,  Victor SUMERIN ,  Markku VAHTERI ,  Anna Maria HARTL

    IPC分类号： C08F10/02 ,  C08J5/18 ,  C08L23/08

    CPC分类号： C08F10/02 ,  C08J5/18 ,  C08L23/0815 ,  C08J2323/06 ,  C08J2323/08 ,  C08J2423/06 ,  C08J2423/08 ,  C08L2205/025 ,  C08L2308/00 ,  C08L2314/02

    摘要： A process for producing a multimodal ethylene polymer comprising the steps of (i) polymerising ethylene in a first polymerisation step in the presence of a Ziegler-Natta polymerisation catalyst to produce a first ethylene homopolymer (PEI) having a melt flow rate MFR2 of from 100 to 300 g/10 min (ISO 1133-1 at 190° C. under 2.16 kg load); (ii) polymerising ethylene in a second polymerisation step in the presence of the first ethylene homopolymer to produce a first ethylene polymer mixture (PEM1) comprising the first ethylene homopolymer and a second ethylene homopolymer, said first ethylene polymer mixture having a melt flow rate MFR2 of from 200 to 1000 g/10 min, and wherein the MFR2 of the first ethylene homopolymer (PEI) is lower than the MFR2 of the first ethylene polymer mixture (PEM1); and (iii) copolymerising ethylene and at least one alpha-olefin comonomer in a third polymerisation step in the presence of the first ethylene polymer mixture to produce a second ethylene polymer mixture (PEM2) comprising the first ethylene polymer mixture and a third ethylene copolymer (PE3), said second ethylene polymer mixture having a density of from 937 to 950 kg/m3 (ISO 1183-2) and a melt flow rate MFR5 of from 0.1 to 5.0 g/10 min (ISO 1133-1 at 190° C. under 5 kg load).